It's almost as if he's speaking to a cult. Might as well have said something along the lines of "Obama is the savior of the US. Let him into your heart and soul and you will know it to be true. Go forth and vote!"
Wait.. are you being sarcastic or you really don't realize that Obama was making a joke when he said that? I remember when he said it and certain media outlets sort of went crazy - but the audience just laughed.